Pumps – Motor driven – Pump within rotary working member
Statutory Invention Registration
1997-08-28
2001-06-05
Carone, Michael J. (Department: 3641)
Pumps
Motor driven
Pump within rotary working member
C417S410400
Statutory Invention Registration
active
H0001966
ABSTRACT:
The present invention relates in general to a gear pump driven by an electric drive motor internally formed therein.
BACKGROUND OF THE INVENTION
Gear pumps which feature polytoothed pinion and ring gears enmeshed at one location within a pump chamber so as to act as impellers for displacement of fluid in response to rotational torque applied to the pinion gear, are generally well known in the art as disclosed for example in U.S. Pat. No. 5,360,325 to Henry, IV et al. Such gear pumps are characterized by operation with substantially reduced noise and have been used for displacement of oil. Also, such gear pumps have been driven by external drivers coupled thereto, such as electric motors. Various problems are however associated with the foregoing type of gear pump often related to the type of fluid being displaced, restricted space requirements and handling of unbalanced axial forces. It is therefore an important object of the present invention to provide the foregoing type of gear pump which avoids leakage, size and installational support problems and other restrictions heretofore associated therewith.
SUMMARY OF THE INVENTION
In accordance with the present invention a reduced noise type of gear pump, formed by enmeshed pinion and ring gears rotatable about closely spaced offset axes within a pump chamber enclosed by a cylindrical bearing portion of a housing rotationally supporting the gears, is sealed between side plates within which stator windings are sealingly mounted as part of an integrated electric motor involving generation of magnetic fields produced internally in response to supply of multi-phase electrical power to the stator windings. Such magnetic fields operatively aligned with permanent magnets disposed within one of the gears as the motor rotor interact therewith to exert rotational torque thereon. By directional control of electrical power input to the stator windings, reversible pump operation is effected by internally motorizing one of the gears for displacement of fluid by the gear teeth acting as impellers.
REFERENCES:
patent: 2386896 (1945-10-01), Hill et al.
patent: 2760348 (1956-08-01), McAdam
patent: 4459087 (1984-07-01), Barge
patent: 5145329 (1992-09-01), Zumbusch et al.
patent: 5360325 (1994-11-01), Henry, IV et al.
Calvert Thomas E.
Flickinger William F.
Henry, IV John W.
Slebzak James S.
Smith Robert C.
Carone Michael J.
Forrest John
Shuster Jacob
The United States of America as represented by the Secretary of
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